China's ZTE has posted its second straight quarterly loss in Q4, to round off its first yearly loss ever.

In a statement Wednesday, the world's fifth-largest telecommunications equipment maker said it booked an annual net loss of 2.84 billion yuan (US$456 million). This was within its preliminary estimates in January of a loss of between 2.5 billion (US$402 million) and 2.9 billion yuan (US$466 million).

ZTE blamed the "significant" decrease in its profit margin due to a large number of low-margin contracts in Africa, South America, Asia and the domestic market.

The company added in the statement: "Owing to the combined effects of, among others, postponed execution of certain systems contracts and decrease in revenue from terminals in the domestic market, and delayed progress of certain international projects, we experienced a decline in overall operating revenue as compared to 2011."

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